The Spax countersunk pozi wood screw is a universal screw which can be used for wood, chipboard, MDF, plastic and thin sheet metal. No pre-drilling required and there is no splitting when working close to the edge. Complete with serrations for quick & safe fastening with reduced driving in torque. There are cutting ribs for easy countersinking and the screw head ribs reduce the thread from being stripped when fixing hinges etc. The Spax countersunk comes with deeper recess which results in a stronger bit hold. They are finished with a hard synthetic coating.